upon behalf of which

Chinese translation: on or in whose behalf / on behalf of whom

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Explanation: ...by his (the subsquent “individual"'s or "person"s ) signature on the instrument, the individual, or the person upon behalf of which the individual acted, executed the instrument.
PERSON兼指自然人与法人
当事人，或其代表的自然人或法人通过在上述文件上签字而使该文件生效